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run code in 150+ php & hhvm versions
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<?php $langs = array('1','2','3'); $arr = array(); foreach($langs as $key => $lang){ $arr[$lang] = $langs; unset($arr[$lang][$key]); sort($arr[$lang]); } print_r($arr);
based on 91PVl
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [1] => Array ( [0] => 2 [1] => 3 ) [2] => Array ( [0] => 1 [1] => 3 ) [3] => Array ( [0] => 1 [1] => 2 ) )